Steel aluminium cable



April 18, 1933' U 1 1,904,116

STEEL ALUMINUM CABLE Filed June 15, 1931 jwenfar' Reinhold Baum WWW Figs.

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1. Application lied has 1|, 10 n. lerlal Ia. 54am, and la Germaaylue :1,1000.

It has already been proposed to make wire cables, the individual wiresof which consist of thesame material, free from twist by equalizing theogpositely directed turning a moments of the di erent layers of wires.The

steps pro to thlsend, viz: adjusting the cross-sections of the wires andthe laying lengths, require a construction difi'erin from the usualmethod of formation, whic 10 cannot be applied t6 the manufacture ofsteel aluminium cables. For on the one hand, the

laying length cannot be increased above a certain amountwithout afiectinthe safety,

and, on the other-hand, with stee aluminium ll cables the ratio of thecross-sectionsof the aluminium and steel wires is limited to a fixedvalue, for which about 6: 1 is found to be the most favorable. If, withsuch. steel aluminium cables, it were desired to equalize athe o 'telydirected turnin moments in the dish em y adjustin 80 of 8 times thediameter of the ca le,f1'md the,

outer layer" of aluminium wires with a laying length of 14 times thediameter of the cable in e opposite direction. This construction,

1 however, is disadvantageous as regards load-' 8! ing capacity becausein consequence of the short laying lengths of the inner layers of wiresthese are insufliciently'strem and-the outer aluminium wires with longlaying ler gh may be overloaded. 4e 1 Q aluminium wires.

la sis of wires, v the laying lengths, these woulddeviate stl furtherfrom-t e ordinar values which have or example, in oroverloading of theouter wires at the expense oomesa-xumj GM, asaroxoa ro mm ,a e :4: xu: m

of the'wires in the inner layers isavoided.

With this object in view the steel wires are not arranged as hitherto inthe middle of the cable but are distributed over the whole!-cross-section partly in the middle of the cable and partly" in layerstogether with the 8 manner.

ed in cross-section), one is employed as the core wire a and the othersb are arranged in the next. layer between the aluminium wires 4 0., Theinnermost and the middle layers are laid in the same direction and theouter layer in the op its direction. 1

at claim is:

A stranded steel aluminium, electrical cable made free from twist byequalizin the oppositely directed turnin momentso the afyers of wireswith a ratio of cross-section l o aluminium to steel of about 6: 1 andlayinten s by.

Fig. 1 shows an elevation and F1 2 a cross-section.

fthe ry steel wires (closely shading lengths about 11-14-times' thediameter of' the cable, in which thesteel wires are dis over the wholecross-section of the cab e, partly in the middle of the cable and partlyin layers togetherwith the aluminium wires. 1 v

In testimony whereof I have name, to this specification.

present invention relates to a stepin v the manufacture ofstrandedsteel-aluminium,

electrical cables, which makes it possible 'completely to equalize the otely v, turning moments of the fierent layers 0 6i without depart fromthe above mentioned favorable ratio of cross section of the steel andaluminium wires of 6:1 or

havi from normal (11 to 1 times the diameter u of the cable), and bywhich, moreover,- an

' i to choose laying lengths difierent signed REIHHOLD BAUM, g

